I tarry, resorting to curiosity (6)
I believe the answer is:
rarity
'curiosity' is the definition.
('rarity' can be a synonym of 'curiosity')
'i tarry resorting' is the wordplay.
'resorting' indicates anagramming the letters.
'i'+'tarry'='itarry'
'itarry' is an anagram of 'RARITY'.
'to' is the link.
(Other definitions for rarity that I've seen before include "wonder" , "Unusual thing" , "It occurs infrequently" , "I tarry (anag.)" , "Unlikely event" .)